带斜撑巨柱框架在重力荷载下的变形和受力分析

Analysis on deformation and forces of mega frame with diagonal brace under gravity load

以华侨城大厦为例,对带斜撑的巨柱框架在重力荷载下的受力和变形进行了剖析,结果表明:斜撑和斜柱共同促使结构发生S形水平变形,并整体倾斜,也导致了楼盖受拉,其形式可分为整体受拉、局部楼层受拉和局部板块受拉等三种。楼板后浇的措施可以减小30%~40%的楼板拉力,但相关钢梁应予以加强。减小巨柱和重力柱的变形差,也可缓解楼盖拉力。

Taking OCT building as an example,deformation and forces of mega frame with diagonal brace were analyzed.The results showed that,the structure slant eastwardly under the action of diagonal brace and inclined column,which accompanied by sigmate deformation.The problem of floor tension can be be summarized as three reasons,which are whole tension,tension on one of a floor and tension on local slab.If post-pouring strip are set during construction,floor slabstress would decrease by 30%~40%,but some steel beams should be strengthened.Tension of concrete floor can be alleviated when the deformation difference between the huge-columns and the gravity column is reduced.